First, Kendra. They'll know each other from School and The Foundation. She's very outgoing, and a Oceanid Nymph! (and has already sent Livia a text :))
Then there's Elias, he's the father of Kara and she'd probably know him from the Foundation, he teaches some classes there.
Next is Domino. He's older, she probably wouldn't know him. He's a were and a flirt (but not with minors)
Then there's Pavel, he's a funny kinda Fae who is dating a half demon and is in college, since she's newer she probably wouldn't know him.
Then there's Kerr. She's like BFF's with Kara (but hates the term BFF). She dresses like a guy mostly so it's quite possible that Livia thinks she's a he (Kerr doesn't correct people either say and it's up to some debate). She's human, but has a spirit or rage living inside her head (not that anyone knows that).